A method to manufacture a display device, includes: forming, on a substrate of the display device, a sacrificial layer including a material, the material including at least one of amorphous carbon, a metal, and an inorganic material; forming a layer covering the sacrificial layer; forming an injection hole exposing the sacrificial layer; removing, via the injection hole, the sacrificial layer to form a microcavity; and disposing liquid crystal in the microcavity.